Keep a live useful when a product demonstration fails

A failed demonstration can still support a useful explanation if the host names what failed and avoids inventing the result that viewers did not see.

A practical procedure

1. Stop the repeated attempt and identify whether the problem belongs to the setup or remains unknown.

2. Use verified specifications or a prepared diagram to answer the immediate question.

3. Offer a later checked demonstration and record what must be tested before making that follow-up.

Worked example: a fictional session

A fictional storage-lock demonstration jams. The host explains the intended mechanism from the instructions and postpones the practical proof until the cause is checked.

Check the limits

Do not describe an unobserved outcome as if the failed demonstration proved it.